But the matching impact bits often dropped off from the pneumatic hammers and led the well accident caused by complex factors.
但是,空气锤、特别是配套冲击钻头断脱导致的井下事故时有发生,影响因素极为复杂。
本网站所收集内容来自网友分享仅供参考,实际请以各学校实际公布信息为主!内容侵权及错误投诉:1553292129@qq.com
CopyRight © 2020-2024 优校网[www.youxiaow.com]版权所有 All Rights Reserved. ICP备案号:浙ICP备2024058711号